Ant task: do not include runtime by default if destination is a jar

compiler/testData/integration/ant/jvm/doNotIncludeRuntimeByDefault/test.kt

@@ -0,0 +1,14 @@
+import java.io.File
+import java.util.jar.JarFile
+
+fun main(args: Array<String>) {
+    val jar = File(args[0])
+    // if "includeRuntime" is specified to be true
+    var specifiedBeTrue = args[1].toBoolean()
+    for (entry in JarFile(jar).entries()) {
+        if (!specifiedBeTrue && entry.name.startsWith("kotlin/")) {
+            println("Error: Kotlin runtime is expected to be excluded if the attribute \"includeRuntime\" is not specified to be true")
+            break;
+        }
+    }
+}